Page "Galaxy" Paragraph 62
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Wikipedia
Current cosmological models of the early Universe are based on the Big Bang theory.
About 300, 000 years after this event, atoms of hydrogen and helium began to form, in an event called recombination.
Nearly all the hydrogen was neutral ( non-ionized ) and readily absorbed light, and no stars had yet formed.
As a result this period has been called the " Dark Ages ".
It was from density fluctuations ( or anisotropic irregularities ) in this primordial matter that larger structures began to appear.
As a result, masses of baryonic matter started to condense within cold dark matter halos.
These primordial structures would eventually become the galaxies we see today.
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